curl --request POST \
  --url https://api.example.com/blockchain/events \
  --header 'Content-Type: application/json' \
  --data '
{
  "event_type": "<string>",
  "timestamp": 123,
  "event_id": "<string>",
  "location": {
    "latitude": 123,
    "longitude": 123,
    "altitude": 123
  },
  "evidence_cid": "<string>",
  "drone_id": "<string>",
  "metadata": {}
}
'

{
  "gas_consumed": 1,
  "status": "<string>",
  "tx_hash": "<string>",
  "block_height": 1,
  "error_message": "<string>"
}